pic reset sometimes

[Squibcakes]

Pedro,

For starters you can put a dump diode across the relay to eliminate any Bemf when the relay turns off.

You could also try try putting an opto coupler between the pic and the relay. I remeber seeing a post a while back with some guy trying to run a hammer bell or something and had simialr probs. Do a search on relays in this forum and you should find a few answers.

Cheers
Squib.

[Pedro Pinto]

Hello Squibcakes

The realys are drived by ULN2003 that have the diodes inside, but the problem is not the relays on the board but the contactors that is drived trough the board relay, if i disconnect
the connector for the ac contactors the board relays make it's work and the pic not reset,
The ac contactors are connect to a 3 phase motor but the pic reset also if the motor are not connect to the ac contactors. I hear form a zero cross code solutions with one resistor, do you know about that?

Thanks for any help
Best regards
Pedro